Improvement in let-off foe loom



@uitrit gisten strnt @fitta Letters Patent No. 81,133, dated August 18, 1868.

i IMPROVEMENT IN LET-OFP FOR LOOM.

dla ttttnltrefetrtt it in time tettett @anni mit mating nrt tt tte tame.

TO ALL WHOMIT MAY CONCERN:

Be it known that I, LEONARD C.v BnrGGs, of Boston, in the county of Suolk, andlState of Massachusetts,l

have invented certain new and useful Improvements 'in Let-Offs for Looms; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and tothe letters of reference marked thereon.

The nature of my invention -eonsists in combining, with the beam ot' a loom, a train of gear-wheels, which connectwith and operate a disk, said disk revolving and traversing upon a fixed scre\v,"in such a manner as to cause a spring, which it acts against, to react upon the spindle of the beam, and lthus to produce friction, and to check, as much as desired, the'free revolution of the beam. i

To enable others skilled inthe art to make and luse my inventiomI will proceed to describe its constructionand use. In the drawings- Y i l Figure 1 isa perspective View of my machine.

Figure '2 is a longitudinal section of a part.

In the drawings, C is the beam, made andV hung in the ordinary manner, but has attached to one en d the small pinion (P, and tothe extreme end of its shaft or`. axle, a. small friction-disk, F;

The pinion P meshes into and actuates the spur-gear O, attached to the shaft Kin a barrel-pinion on the shaft I. D-is a stationary urm,lat tacl1ed permanently to the standard B, by means of the set-nut'E. A screw-thread is cut upon( D, upon which screws,- as aunt, the gear'wheel S is a spiral spring, one end of which rests against the wheel L, while the other end rests against the friction-disk F, so that if from any cause lthe wheel L be screwed towards F, pressure will be brought t bear upon 'the spring S, and by the spring transmitted tothe friction-disk F, the friction upon F being more or less, as the wheel L is nearer or more remote from F. .I

From inspection of the drawings, it will be Aseen that it' the beam C be revolved, a very slow motion will be given through the pinion I, spur-wheelO, and'pini-on Kto thewheel L, thus causing it to advance or lrecede on thc screiv-arm D, and thus to exert more orl less pressure upon the spring S; in other words, it will-increase or lessen the friction on thedisli F, and thus-regulate the motion of the beam C.

The object of my invention is tosc varythe amount of friction upon the beam C, that the tension of the warp shall be always the same, whether the beam be full or nearly empty.: Instead of the spiral spring S, an elliptical or any suitablespring may be substituted. I I

What I claim as my invention, and desire to secure by Letters Patent, is

1. 'lhe combination and arrangement of the wheel L, the screw-arm D, the spring S, and frictiomdisk F, working substantially as described, and for the purpose set forth. 5

2. The combination and arrangement of itspinion l?, spurwhcel O, shaft I, barrel-pinion K, wheel L, the screw-arm I), spring S, and friction-disk F, Working substantially as described, and for thepurpose set forth.

' LEONARD o. BRIGGS.

Witnesses:

FRANK G. PAnKEin, A. HUN BERRY. 

